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MM: Fachverband Metall- und Materialphysik
MM 37: Materials for Energy Storage and Conversion - Structure of Battery Materials
MM 37.5: Vortrag
Mittwoch, 18. März 2020, 12:45–13:00, IFW D
Graded electrodes for lithium-ion batteries — •Chuan Cheng1, Ross Drummond2, Stephen Duncan2, and Patrick Grant3 — 1Warwick Manufacturing Group (WMG), University of Warwick, Coventry CV4 7AL, UK — 2Department of Engineering Science, University of Oxford, Oxford OX1 3PJ, UK. — 3Department of Materials, University of Oxford, Oxford OX1 3PH, UK.
Homogeneous electrode structures used in conventional Li-ion batteries (LIB) lead to inhomogeneous active material utilization and gradients of overpotential and Li-ion concentration at the cell-scale, which are detrimental for both capacity retention at high charge-discharge rates and for battery lifetime. To account for these gradients, we demonstrate that heterogenous electrode structures with engineered gradients in material distribution can improve LIB C-rate and long-term cycling performance when compared with conventional uniform electrodes in full-cell and half-cell LIBs. The improved performance of graded electrodes is shown to derive from a lower charge transfer resistance and reduced polarization at high C-rates, which suggests a more spatially homogeneous distribution of over-potential and hindering of the side reaction-induced battery degradation during long-term cycling.
References
[1] C. Cheng, R. Drummond, S. R. Duncan, and P. S. Grant, J. Power Sources 413, 59 (2019).
[2] C. Cheng, R. Drummond, S. R. Duncan, and P. S. Grant, J. Power Sources, In Press. https://doi.org/10.1016/j.jpowsour.2019.227376